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Re: Oh my! Nostalgia!

Jim Thomps>

>> Oh my! Nostalgia! >> >> Stumbled onto this site... >> >>
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>> >> I built the FM3 and the PAS2 when I was a kid ;-) >> > >I built more mean stuff when I was a kid. An amplifier with several big >horizontal flyback tubes in there etc. 900V on the plates, directly >cascaded out of 230V grounded mains, sans transformer because that would >have cost too much... > >Actually I still got that amp but a typical 120V circuit is too wimpy >for it.

I built at least six different tube power amplifiers, starting with

6V6, then 6L6, then a variety of 6550, KT88 and similar.

...Jim Thompson

--
|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
|  Analog/Mixed-Signal ASIC\'s and Discrete Systems  |    manus    |
|  Phoenix, Arizona            Voice:(480)460-2350  |             |
|  E-mail Address at Website     Fax:(480)460-2142  |  Brass Rat  |
|       http://www.analog-innovations.com           |    1962     |
             
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Jim Thompson
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Mine was with PL509 tubes. Those are color TV flyback drivers rated at

30W plate dissipation. But you could push them up to 70-80W dissipation before the plates went from cherry-red to orange.

Of course having to always watch the plates and make sure they don't go too far into an orange glow was a hassle. So, I built the gorilla of all amplifiers with two of these puppies:

5kV on the plates. Those tubes can easily pack away 500W of plate dissipation without a whiff of redness. Each. 
--
Regards, Joerg

http://www.analogconsultants.com
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Joerg

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